Lecture for Divine Child High School Physics.We'll be starting with one dimensional motion. I know you're familiar with 2d and 3d motion, but 1d motion is not something you've thought about before.We of course, live in a 3d world. When you look at the piece of paper you're taking notes on you're looking at a 2d world. So one dimensional motion would be motion along a line. There is forwards and backwards, but no right or left.